Discard about half the oil, then increase heat to medium-high.
Sauté the remaining garlic, shallots, and lemongrass until fragrant (about 1 minute).
Add seasoned pork and liver, cooking for 4-5 minutes until fully cooked.
Stir in mint, culantro, and Vietnamese mint. Season with fish sauce. If the mixture looks dry, add 1-2 tbsp of water or stock.